Low power universal serial bus
AssigneeIntel Corporation
InventorsHuimin Chen, Kok Hong Chan
Life of this patent
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Abstract
Systems and method for operating a low power universal serial bus are described herein. A universal serial bus port includes a link layer and protocol layer that are compatible with a standard USB2 protocol. The link layer and protocol layer to control a physical layer for transmitting and receiving data on a pair of signal lines. The physical layer includes a fully-digital Low-Speed/Full-Speed (LS/FS) transceiver to transmit and receive data on the pair signal lines using single-ended digital communications on the pair of signal lines.
Claims39
1-20. (canceled)
A universal serial bus apparatus, comprising:
- a physical layer, comprising;
- a first signal line eD+;
- a second signal line eD−;
- a single-ended driver enable SE_Driver_Enable;
- a single-ended receiver enable SE_Receiver_Enable;
- a first Low-speed/Full-speed transmitter having a single-ended driver input SE_Driver_Input_P, an input coupled to the single-ended driver enable SE_Driver_Enable, and an output coupled to the first signal line eD+;
- a second Low-speed/Full-speed transmitter having a single-ended driver input SE_Driver_Input_N, an input coupled to the single-ended driver enable SE_Driver_Enable, and an output to be coupled to the second signal line eD−;
- a first Low-speed/Full-speed receiver having an input coupled to the first signal line eD+, an input coupled to the single-ended receiver enable SE_Receiver_Enable, and an output coupled to a single-ended receiver output SE_Receiver_Output_P;
- a second Low-speed/Full-speed receiver having an input coupled to the second signal line eD−, an input coupled to the single-ended receiver enable SE_Receiver_Enable, and an output coupled to a single-ended receiver output SE_Receiver_Output_N;
- a first pull-down resistor Rpd having a first terminal coupled to the first signal line eD+ and a second terminal;
- and
- a second pull-down resistor Rpd having a first terminal coupled to the second signal line eD− and a second terminal coupled to the second terminal of the first pull-down resistor.
A universal serial bus apparatus, comprising:
- a physical layer, comprising;
- a pair of Low-speed/Full-speed transmitters to be coupled to a pair of signal lines and to transmit data to the pair of signal lines using single-ended digital communication;
- and
- a pair of Low-speed/Full-speed receivers to be coupled to the pair of signal lines and to receive data from the pair of signal lines using single-ended digital communication.
Dependencies are inferred from the claim text.